Cylinder ridge reamer



p 1933- c. A. OLSON 1,9

CYLINDER RIDGE REAMER Filed May 11, 1951 I $iu ulmu w k MIIIIMHIME I? /i052% (0% W/ 6672 $0022 Patented Sept. 19, 1933 CYLINDER RIDGE REAMERCarl A. Olson, Clarinda, Iowa, assignor, by mesne assignments, to LisleCorporation, Clarinda, Iowa, a corporation of Iowa 7 Application May 11,1931. Serial No. 536,522

5 Claims. (01. 77-76 The object of this invention is to provide animproved construction for a tool for easily, quick ly and accuratelyremoving a ridge or ledge from a cylinder whereby the walls of thecylinder may be uniform in contour throughout their length.

A further object of the invention is to provide an improved cylinderreamer especially designed for use in trimming off 'a ledge orprojection formed at the upper end of the cylinder ofan internalcombustion engine because of the fact that the uppermost piston ringdoes not travel entirely to the top of the cylinder bore and the wearfrom ordinary usage consequently does not extend entirely to the top.

Still another object is to provide a cylinder ridge reamer which iscapable of beingf'expanded for operation on cylinders of variousdiameters and which is so arranged that the expansion takes placeuniformly on radial'lines.

Another and further object of the invention is to provide improved meansfor adjustment of the cutting tool and of the stop means for terminatingthe operation of the tool in conformity with the contour of the wornportions of the cylinder wall.

With these and other objects in view my in vention consists in theconstruction, arrangement and combination of the various parts of mydevice, whereby the objects contemplated are attained, as hereinaftermore fully set forth, pointed out in my claims, and illustrated in theaccompanying drawing, in which:'

.Figure l is a perspective View of my improved cylinder ridge reamer.

Figure 2 is a vertical section of the same on the line 2-2 of Figure 1,and illustrating the tool in position for use.

Figure 3 is a horizontal section on the line 3-3 of Figure 2.

Figure 4 is a sectional view showing a piston in its cylinder andillustrating the condition which my improved tool is designed torelieve. I

The wear on the wall of a cylinder such as 10 is not'usually uniform ina direction circumferentially of the cylinder wall,nor in a directionlongitudinally of the bore. The piston 12 in its travel often causes thecylinder wall to be worn to an out of round condition and furthermore aridge or ledge such as 14 isleft at the top of the cylinder bore becauseof the fact that the uppermost'piston ring 16, which is expandedresiliently against the cylinder wall, does not travel entirely to thetop of the bore. 7 Before installing a newpiston in a cylinder or newrings on an old piston, it is necessary to remove the ledge or ridge 14in order thatthe pis-' ton and its rings may be properly fitted and inorder to avoid any click or knock which would be occasioned byengagement of the new ring 16with the ledge. 1

The ordinary method of removing the ledge orridge such as 14 has been'bythe use of a hand tool or by rubbing with abrasive material. This such amethod to make the upper end of the cylinder bore conform to theremaining portions of the cylinder wall because, for, one thing, the

cylinder wall is not always Worn to true cylin-.

to the curvature of the remaining portion's orv in other words, thoseportions which have been wornby travel of the piston and its rings.

The body of the tool includes a top plate 18 and a bottom plate 20 whichare of substantially conical form and arranged with their points di-,

'rected toward each other and variably spaced apart. For adjustablyconnecting theplates l8 and 20 I employ a series of rods 22, in thisinstance three in number, which are fixed at their upper is slow workand furthermore, it is difiicult by ends to the top plate 18 and whichpass slidably through the plate 20. u 1

A series of carriers are movably mounted between the head platelB andbase plate 29 and are formed tapering at; their ends for engagement withthe opposed conical surfacesof said plates. Two of the carrier membersare alike in construction and are designated by the numerals "24'and 26,but the other carrier member. 28 is slightly different. Each carriermember is formed at its.

upper end with a reduced tongue 30 engaging slidably in a groove 32. inthe lower surface of the topplate 18 and each carrier, is formed at itslower end with a tongue '34 engaging in a groove 36 in the upper surfaceof the bottom plate. It will be observed that these tongue and grooveconnections are on inclined lines relative to the axis of the device andthat this permits an expansion and contraction of 'thecarriers relativeto the conical top and bottom plates by radial outf ward and inwardmovement.

The head plate 18 and bottom plate 20 arefurther connectedby a screwheaded bolt 38 upon the threaded lower end of which is-mounted a nut 40.The head of the bolt 38 is located .in an angular-recess 42 opening tothe top of the plate 18, and this recess isadapted to receive asuit abletool such as44 by means jof which the devicev may be manuallyrotated.

In the lower surface of the b ottom plat'e20 is formed an angular recessl6 adapted to snugly receive the nut 40 and prevent rotary movementthereof. An expansion spring 48 i's' mountedon the bolt 38 within therecess 46 and behind'the" nut 40. If desired, a pin .50 maybe mountedthrough the lower end of the bolt to prevent accidental removal of thenut 40. v

The carrier members 24 and 26 are formed with outwardly opening recesses52 within which rollersv the ledge or ridge 14 at the top of thecylinder.

The other carrier member 28 is formed with a smaller laterally openingrecess 60 within which a roller 62 is journaled on a verticallyextending pin 64. The roller 62 is adapted to travel entirelywithin thecylinder and in contact with its wall. I

The carrier member 28 is also formed in its outer face with an angularrecess 66 in which a cutter blade 68 is mounted, said blade being backedby an expansive spring 70 mounted in'the inner end of the recess. tingedge of the blade 68, which is vertically arranged, to be projectedslightly beyond the wall of the carrier member. t

A stop member 72 is disposed at the outer. side of the carrier member 28above the cutter blade 68 and is formed of a vertically arranged platethrough which a threaded screw 74 is loosely mounted. A laterallyopening threaded bore 76 is formed in the carrier member 28 and withinthis boreis threaded an adjusting screw 78 which ishollow and internallythreaded to receive the screw 74. The adjusting screw 78 is adapted to Ibe engaged at its outer end by the'stop plate 72 when the screw 74 istightened up. The screw 78 is formed at its outer end with a screwdriver slot 80whereby it may be adjusted in 'the'threaded bore 76; v

The carrier member 28 is formed with an upwardly opening threaded bore82 which intersects the bore 76. In the bore 82 is mounted a set screw84.adapted to engage the hollowadjusting screw 78 and hold it inadjusted position. When the stop plate 72 is .drawn'up tightly againstthe outer end of the adjusting screw 78 by means of the-screw 74 itforms a positive stop means which is adjustable and yet is held rigidlyin any selected position of adjustment.

The stop plate 72 overlaps at. its lower end the upper edge of thecutting blade 68 and serves to limit outward movement of the blade underthe influence of the spring 70. v

The hollow adjusting sc'rew 78 is set in such p0 sition that its outerend is in vertical alignment with the periphery of the roller 62 and isheld in such adjustment by the set screw 84. The position of the screw78 is not ordinarily disturbed ex cept to compensate for wearand it thusserves to govern the position of the inner face of the stop plate 72 inline with the roller 62 for forming a stop'for the cutting. blade68,which will conform to the position of said roller.

1 The carrier members-24,j26 and 28 areyield ingly held in position withrespectto thehead plate 18 and bottom plate 28 by meansof a pair ofendless coil springs 86 and 88 encircling said carrier members andpreferably mounted in transverse grooves 96 formed in their outer faces.

In practical use the tool isplaced in position within the upper end ofthe bore of a cylinder and a screw driver or the like is employed forexpanding the tool by tightening the bolt 38, it be ing understood thatthe nut 40 on said bolt is held against rotation by engagement in there- 'cess 46. The tightening of the bolt 38 causes the Each roller 54 isThe spring causes the cut-- peripheries of the rollers 54 and 62 engagethe inner wall of the cylinder and then is continued somewhat past thatpoint, thereby relieving the tension on the springs 86 and 88 andplacing the spring '48 under tension.

The tool'is supportedwith respect to the cylinder lll'byi means of theflanges 58 on therollers 54 and also by the stop plate 72 which engagesthe top of thecylinder wall. In this position the rollers 54 and 62 arein engagement with the worn portion of the cylinder wall and the pointof the cutting blade 68 restsagainst. the ridge or ledge 14 atthe upperend of the cylinder and is forced thereagainst by action of the spring70.

Rotary oscillation .is then imparted to the reamer manually by the useof the wrench or tool 44, thereby causing the blade68 to cut and reamaway the projecting ledge 14. The contact ofv the cylinder causes theblade 68 to conform to the contour'of the cylinder wall sothat saidblade cuts away the projection 14in conformity with such contour. of theroller 621s in exact vertical line'iwith the inner face of the stopmember 72, it follows that this cutting operation will be automaticallyterminated by contact of the blade with the inner face of said stopmember, when the projecting ledge has been cut away to the proper amountto conform exactly with the wornoylinder wall.

This is true even though the contour of theworn wall may not be exactlycylindrical, inasmuch as the tensioniof the spring 48 causes the roller62' c to travel at all times in exact contact with. the

worn cylinder wall and the spring 70 causes the blade 68 to be thrustoutwardly to perforrnits work. 7 In other words the carrier members 24and 26which are provided with therollers 54 and the carrier member 28which is provide-d with the roller 62and stop 72,are forcibly expandedwithin the cylinder so thatthe roller 62 is caused to follow accuratelythe cylinder wall and to determine the position of the stop member 72against which the cutting blade 68 is engageable at the limit of thecutting operation.

The reamer is very easily operated by manipu lating the wrench or handtool 44 so that the projecting ledge 14 is easily andv quickly cut awayconform to the worn part of the wall below it; It

Inasmuch as the outer periphery will be observed that the angularopening for the tool 44 is always located at the axial center of thereamer because, the. carrier members for the rollers and cutting: bladeare radially arranged about theaxis of the tool and are caused to moveuniformly on radial lines.

While the enlarged flanges 58 on the upper ends of therollers 54 .form aconvenientmeans for supporting the reamer with respect to the cylinder,yet I do not wish to be understood as limiting myself to this particular,means inas-' much as equivalent supporting means may be employed ifdesired." I f y Considerable expansion of the reamer for work oncylinders of differentv diameter may be obtained because of the taperedformation of the heads 18 and 20 and the carrier members 24, 26 and 28.The inclined tongue and groove connections between these members permitseasy slid.-

ing movement of the carrier members in expanding and contractingthereamer to the desired diameter.

This tool has been especially designed for use on cylinders of internalcombustion engines, but

it is obvious that it may beapplied in connection with any cylinderthathas a similar projecting portion to that indicated by the numeral14, and I do not desire to be understood as limiting myself to the exactmethod .of use or the particu having oppositely inclined faces on theiradjacent sides, a plurality of carrier members having inclined facescontacting with the faces of said heads, resilient means acting to holdsaid car'- rier members in place between the heads and tending to movethem inwardly whereby said heads are forced apart by mutual engagementof said inclined faces, rollers pivoted on said carrier members, a bolthaving a threaded connection for adjustably connecting said heads, aspring means adapted to be placed under compression by tighteningmovement of said bolt when the carrier members are confined againstoutward movement, thereby yieldinglyforcing said rollers into engagementwith the surface of p a cylinder within which the reamer is operated, ablade slidably mounted in one of said carrier members, a spring actingto move saidblade outwardly for operation on a partof the cylinder wall,and a stop means for limiting outward movement of said blade whereby tolimit its cutting operation to conform to the surface'engaged by saidrollers, said stop means including a hollow screw threaded in the lastnamed carrier member, a stop plate, and a screw for holding said plateagainst the outer end of said hollow screw.

2. A cylinder ridge reamer comprising a pair of substantially conicalheads arranged with their bases away from each other, a plurality ofcarrier members each having inclined ends in slidable engagement withthe conical surfaces of the respective heads and movable onsubstantially radial lines, rollers pivoted on vertical axes on saidcarrier members adapted to engage a cylinder wall and travel thereon, abolt extendingadjustably through, said heads and having a threadedconnection adapted to be tightened for drawing said heads together andthereby forcing the carrier members outwardly, yielding means adapted tobe placed under compression by such tightening and tending to force saidcarrier members and rollers outwardly, stop means carried by one of saidcarrier members in a position conforming to the periphery of its roller,and a yieldably mounted blade carried by the last named carriermemberfor engagement with a portion of the cylinder wall and limited inits movement by said stop means, whereby the cutting operation of saidblade will be caused to conform to the contour of the surface engaged bysaid roller. 7

3. A cylinder ridge reamer comprising a pair of substantially conicalheads arranged with their bases away from each other, rods on one ofsaid heads extending slidably through the other, a plurality of carriermembers each having inclined ends in slidable engagement with theconical surfaces of the respective heads and movable onsubstantiallyradial lines, rollers pivheads are forced apart by mutualengagement of in which the reamer isoperated, a bladeon one oted onvertical axes on said carrier members adapted to engage a cylinder walland travel thereon, a bolt mounted slidably through said heads, anuthaving a threaded e'ngagementwith said bolt and held against rotation, aspring on said bolt adapted to be placed under compres sion bytightening'movement of, the bolt when said carrier members are confinedagainst'outward movement, said'spring tending to move saidrollersoutwardly into contact with the cylinder wall, and permittingthem to-move inwardly under pressure, a blade carried by the last namedcarrier member for engagement with a portion Q of the cylinder'wall andmeans to limit the cutting operation of said blade so that the cut" willbe caused to conform to the contour of the surface engaged by saidroller. 7 a p 4. A cylinder ridge reamer comprising a pair of spacedrelatively movable heads having oppositely inclined faces ontheiradjacent sides, a a

plurality of carrier members having inclined faces contacting with thefaces of said heads, resilient means acting to hold said carrier mem-'-bers in place between the heads and tending to move them inwardly onradial lines, rollers rotatably mounted on said carrier members, a boltaffording an adjustable connection for drawing said heads together andthereby exerting outward pressure on the carrier members; resilientmeans adapted to be placed under compression by tightening movement ofsaid bolt whenthe carrier members are confined against outward movement,thereby yieldinglyforcing said roll ers into engagement with the surfaceof a cylin- 1 der within which the reamer is operated, a blade slidablymounted in one of said carrier members, yielding means acting to movesaid blade outwardly for operation ona part of the cylinder wall, andstop means for limiting outward movement of said blade whereby toterminate its cutting operation in conformity to the'surface en'- gagedby said rollers, s'aidstop means including a hollow screw threaded inthe last named carrier member, a part atthe outer end of said screwadapted to be engaged by said blade, and Q of spaced adjustablyconnected heads, said heads' having oppositely inclined faces on theiradjacent sides, a plurality of carrier members having inclined facescontacting with the faces of, said heads, resilient means acting to hold'said carrier members in place between the heads and tending to movethem inwardly whereby said said inclined faces, guides on'said carriermembers, a bolt having a threaded connection for adjustably connectingsaidheads, spring means adapted to be placed under compression bytightening movement, of said bolt when'the carrier members are confinedagainst outward .movement, thereby yieldingly forcing saidguides intoengagement with the surface of a cylinder withof said carrier-membersyieldingly forced out wardly for operation on-a part of the cylinderwall, and a stop member, the guides, blade and stop member being soconstructed and arranged as to limit the cutting operation of the bladeto conform to the surface engaged by said guides.

CARL A. OLSON.

